<template>
<div>
	<router-link tag="div"  to="/" class="header-abs" v-show="showAbs">
		<div class="iconfont header-abs-icon">&#xe624;</div>
	</router-link>
    <div class="header-fixed" v-show="!showAbs" :style="opacityStyle">
        <router-link to="/">
     	<div class="iconfont header-iconBack">&#xe624;</div>
        </router-link>
			    景点详情
	</div>
</div>
</template>

<script>
export default {
	name:'DetailHeader',
	data () {
		return{
			showAbs:true,
			opacityStyle: {
				opacity:0
			}
		}
	},
	methods:{
		handleScroll (){
			const top=document.documentElement.scrollTop
			if (top >60){
				let opacity=top/140
				opacity=opacity>1?1:opacity
				this.opacityStyle={opacity}
				this.showAbs=false
			}
			else{
				this.showAbs=true
			}
		}
	},
	activated () {
		window.addEventListener('scroll',this.handleScroll)
	},
	deactivated () {
		window.removeEventListener('scroll',this.handleScroll)
	}
}
</script>

<style lang="stylus" scoped>
  @import '~styles/varibles.styl'
.header-abs
 position:absolute
 left:.2rem
 top:.2rem
 width:.7rem
 height:.7rem
 border-radius:.4rem
 text-align:center
 background: rgba(0,0,0,.2)
.header-abs-icon
 color:#fff
 text-align:center
 margin-top:.2rem
.header-fixed
 z-index:2
 position:fixed
 top:0
 left:0
 height:.86rem
 line-height:.86rem
 width:100%
 background:$bgColor
 color:#fff
 text-align:center
.header-iconBack
 position:absolute
 top:0
 left:0
 width:.64rem
 color:#fff
</style>